linux-kernel - Re: [RFC PATCH v2 1/2] dt-bindings: sc16is7xx: Add property to change GPIO function

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Message-ID: <20230518-paralegal-stalemate-837e59310526@spud>
Date:   Thu, 18 May 2023 20:24:23 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Hugo Villeneuve <hugo@...ovil.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-gpio@...r.kernel.org,
        Hugo Villeneuve <hvilleneuve@...onoff.com>,
        linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 1/2] dt-bindings: sc16is7xx: Add property to
 change GPIO function

On Thu, May 18, 2023 at 09:29:06AM -0400, Hugo Villeneuve wrote:
> From: Hugo Villeneuve <hvilleneuve@...onoff.com>
> 
> Some variants in this series of uart controllers have GPIO pins that
> are shared between GPIO and modem control lines.
> 
> The pin mux mode (GPIO or modem control lines) can be set for each
> ports (channels) supported by the variant.
> 
> This adds a property to the device tree to set the GPIO pin mux to
> modem control lines on selected ports if needed.
> 
> Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>

On the basis of similarity to existing properties due to my lack of
understanding of the hardware it'll have to be an Ack. Hopefully Greg &
Co. have more specific insight.
Acked-by: Conor Dooley <conor.dooley@...rochip.com>

Thanks,
Conor.

> ---
> v1 -> v2: Add nxp vendor prefix
>           Add git base-commit
> 
>  .../bindings/serial/nxp,sc16is7xx.txt         | 28 +++++++++++++++++++
>  1 file changed, 28 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
> index 0fa8e3e43bf8..23a81c83f012 100644
> --- a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
> +++ b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
> @@ -23,6 +23,9 @@ Optional properties:
>      1 = active low.
>  - irda-mode-ports: An array that lists the indices of the port that
>  		   should operate in IrDA mode.
> +- nxp,modem-control-line-ports: An array that lists the indices of the port that
> +				should have shared GPIO lines configured as modem
> +				control lines.
>  
>  Example:
>          sc16is750: sc16is750@51 {
> @@ -35,6 +38,17 @@ Example:
>                  #gpio-cells = <2>;
>          };
>  
> +	sc16is752: sc16is752@54 {
> +		compatible = "nxp,sc16is752";
> +		reg = <0x54>;
> +		clocks = <&clk20m>;
> +		interrupt-parent = <&gpio3>;
> +		interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
> +		nxp,modem-control-line-ports = <1>; /* Port 1 as modem control lines */
> +		gpio-controller; /* Port 0 as GPIOs */
> +		#gpio-cells = <2>;
> +	};
> +
>  * spi as bus
>  
>  Required properties:
> @@ -59,6 +73,9 @@ Optional properties:
>      1 = active low.
>  - irda-mode-ports: An array that lists the indices of the port that
>  		   should operate in IrDA mode.
> +- nxp,modem-control-line-ports: An array that lists the indices of the port that
> +				should have shared GPIO lines configured as modem
> +				control lines.
>  
>  Example:
>  	sc16is750: sc16is750@0 {
> @@ -70,3 +87,14 @@ Example:
>  		gpio-controller;
>  		#gpio-cells = <2>;
>  	};
> +
> +	sc16is752: sc16is752@0 {
> +		compatible = "nxp,sc16is752";
> +		reg = <0>;
> +		clocks = <&clk20m>;
> +		interrupt-parent = <&gpio3>;
> +		interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
> +		nxp,modem-control-line-ports = <1>; /* Port 1 as modem control lines */
> +		gpio-controller; /* Port 0 as GPIOs */
> +		#gpio-cells = <2>;
> +	};
> 
> base-commit: 4d6d4c7f541d7027beed4fb86eb2c451bd8d6fff
> -- 
> 2.30.2
> 

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